A small impeller meter main purposes: water heater thermostat, water purifiers, fireplaces, fountains, coffee machines, smart card equipment, boiler combustion appliances such as water flow sensing. 2 small impeller flowmeter basic parameters: No. Item Parameter Unit Remark 1 start water flow ≥1.0 L / min (l min) 2 work flow range 1-30 L / min (l / min) 3 Start pressure ≥0.1 Mpa ( MPa) at least 4 to withstand water pressure 1.2 Mpa (MPa) 5 maximum withstand water pressure 1.6 Mpa (MPa) 6 Operating ambient temperature 1-100 ℃ (Celsius) 7 Ambient temperature -40-150 ℃ (Celsius) 8 Use life 106 times (switching cycles) 5VDC 10mA 9 operating voltage range 3.5-24 VDC (DC voltage) 10 operating current 0.5-1.5 mA (milliamps) 11 output characteristics [7.8Q-3] ± 10% Hz (Hertz) error ± 10% 12 Electric strength> 600 VAC (AC voltage) Duration 5S leakage 3mA 13 Insulation resistance> 100 MΩ (megohms) connector and the insulation resistance between the shell or body